Chapter 15.8 and 15.9 Lecture 3/23/15
https://www.youtube.com/watch?v=niw1NiZaJfA
Chapter 15.6 and 15.7 Lecture 3/20/15
https://www.youtube.com/watch?v=CQpHDfCwW6E
Chapter 5.1 and 5.2 Lecture 9/9/14
https://www.youtube.com/watch?v=V3uZvV1iFe8&list=UUHUCCCeJ3pfGkQ8tMA1lUfg
https://www.youtube.com/watch?v=V3uZvV1iFe8&list=UUHUCCCeJ3pfGkQ8tMA1lUfg